DilatingSentiment/HeartPulse_Synth.ino at master · HackTheBrain/DilatingSentiment · GitHub

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#include <SoftwareSerial.h>

//Definitions
//MIDI
#define VS1053_RX  2
#define VS1053_RESET 9
#define VS1053_BANK_DEFAULT 0x00
#define VS1053_BANK_DRUMS1 0x78
#define VS1053_BANK_DRUMS2 0x7F
#define VS1053_BANK_MELODY 0x79
#define VS1053_GM1_SOUND 15
#define MIDI_NOTE_ON  0x90
#define MIDI_NOTE_OFF 0x80
#define MIDI_CHAN_MSG 0xB0
#define MIDI_CHAN_BANK 0x00
#define MIDI_CHAN_VOLUME 0x07
#define MIDI_CHAN_PROGRAM 0xC0

SoftwareSerial VS1053_MIDI(0, 2);

//Heartbeat
const int HR_RX = 5;
int ledPin = 4;
byte oldSample, sample;

void setup() {
  Serial.begin(9600);
  VS1053_MIDI.begin(31250);

  //Heartrate
  pinMode (HR_RX, INPUT);  //Signal pin to input
  pinMode (ledPin, OUTPUT);

  Serial.println("Waiting for heart beat...");

  while (!digitalRead(HR_RX)) {};
  Serial.println ("Heart beat detected!");

  //Synth
  pinMode(VS1053_RESET, OUTPUT);
  digitalWrite(VS1053_RESET, LOW);
  delay(10);
  digitalWrite(VS1053_RESET, HIGH);
  delay(10);

  midiSetChannelBank(0, VS1053_BANK_MELODY);
  midiSetInstrument(0, VS1053_GM1_SOUND);
  midiSetChannelVolume(0, 100);
}

void loop() {
  sample = digitalRead(HR_RX);  //Store signal output
  if (sample && (oldSample != sample)) {
    Serial.println("beat");
    midiNoteOn(0, 60, 127);
    delay(sample);
    midiNoteOff(0, oldSample, 127);
    delay(oldSample);

  };
  oldSample = sample;           //Store last signal received
}

void midiSetInstrument(uint8_t chan, uint8_t inst) {
  if (chan > 15) return;
  inst --;
  if (inst > 127) return;

  VS1053_MIDI.write(MIDI_CHAN_PROGRAM | chan);
  VS1053_MIDI.write(inst);
}

void midiSetChannelVolume(uint8_t chan, uint8_t vol) {
  if (chan > 15) return;
  if (vol > 127) return;

  VS1053_MIDI.write(MIDI_CHAN_MSG | chan);
  VS1053_MIDI.write(MIDI_CHAN_VOLUME);
  VS1053_MIDI.write(vol);
}


void midiSetChannelBank(uint8_t chan, uint8_t bank) {
  if (chan > 15) return;
  if (bank > 127) return;

  VS1053_MIDI.write(MIDI_CHAN_MSG | chan);
  VS1053_MIDI.write((uint8_t)MIDI_CHAN_BANK);
  VS1053_MIDI.write(bank);
}

void midiNoteOn(uint8_t chan, uint8_t n, uint8_t vel) {
  if (chan > 15) return;
  if (n > 127) return;
  if (vel > 127) return;

  VS1053_MIDI.write(MIDI_NOTE_ON | chan);
  VS1053_MIDI.write(n);
  VS1053_MIDI.write(vel);
}

void midiNoteOff(uint8_t chan, uint8_t n, uint8_t vel) {
  if (chan > 15) return;
  if (n > 127) return;
  if (vel > 127) return;

  VS1053_MIDI.write(MIDI_NOTE_OFF | chan);
  VS1053_MIDI.write(n);
  VS1053_MIDI.write(vel);
}